Linux/Unix 主機上安裝了一個或多個受到弱點影響的套件，且供應商未提供可用的修補程式。

  - ipmi解除安裝 ipmi_si 和 ipmi_msghandler 模組時修正 UAF 您好在測試 ipmi_si.ko 和 ipmi_msghandler.ko 的安裝和解除安裝時系統當機。記錄如下[ 141.087026] 錯誤無法處理 ffffffffc09b3a5a 的核心分頁要求 [ 141.087241] PGD 8fe4c0d067 P4D 8fe4c0d067 PUD 8fe4c0f067 PMD 103ad89067 PTE 0 [ 141.087464] Oops0010 [#1] SMP NOPTI [ 141.087580] CPU67 PID668 Commkworker/67:1 Kdump載入的 未受污染 4.18.0.x86_64 #47 [ 141.088009] 工作佇列事件 0xffffffffc09b3a40 [ 141.088009] RIP 0010:0xffffffffc09b3a5a [ 141.088009] 程式碼錯誤的 RIP 值。 [141.088009] RSP 0018:ffffb9094e2c3e88 EFLAGS 00010246 [ 141.088009] RAX 0000000000000000 RBX
    ffff9abfdb1f04a0 RCX 0000000000000000 [ 141.088009] RDX 0000000000000000 RSI 0000000000000246 RDI
    0000000000000246 [ 141.088009] RBP: 0000000000000000 R08: ffff9abfffee3cb8 R09: 00000000000002e1 [141.088009] R10: ffffb9094cb73d90 R11: 00000000000f4240 R12: ffff9abfffee8700 [ 141.088009] R13:
     R140000000000000000  : ffff9abfdb1f04a0 R15: ffff9abfdb1f04a8 [ 141.088009] FS: 0000000000000000(0000) GS:ffff9abfffec0000(0000) knlGS:0000000000000000 [ 141.088009] CS: 0010 DS: 0000 ES: 0000 CR0:
    0000000080050033 [ 141.088009] CR2: ffffffffc09b3a30 CR3: 0000008fe4c0a001 CR4: 00000000007606e0 [141.088009] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 141.088009] DR3:
    0000000000000000 DR600000000ffffe0ff0 DR70000000000000400 [ 141.088009] PKRU55555554 [ 141.088009] 呼叫追踪 [ 141.088009] process_one_work+0x195/0x390 [ 141.088009] ? worker_thread+0x30/0x390 [141.088009] ? process_one_work+0x390/0x390 [ 141.088009] ? kthread+0x10d/0x130 [ 141.088009] ? kthread_flush_work_fn+0x10/0x10 [ 141.088009] ? ret_from_fork+0x35/0x40] 錯誤無法處理 ffffffffc0b28a5a 處的核心分頁要求 [ 200.223240] PGD 97fe00d067 P4D 97fe00d067 PUD 97fe00f067 PMD a580cbf067 PTE 0 [ 200.223464#1Oops0010 [ 200.223579] CPU: SMP NOPTI [ [ 6] PID664 Commkworker/63:1 Kdumploaded 未受污染 4.18.0.x86_64 #46 [ 200.224008] 工作佇列事件 0xffffffffc0b28a40 [200.224008] RIP 0010:0xffffffffc0b28a5a [ 200.224008] 程式碼錯誤的 RIP 值。 [ 200.224008] RSP
    0018:ffffbf3c8e2a3e88 EFLAGS00010246 [ 200.224008] RAX0000000000000000 RBXffffa0799ad6bca0 RCX
    0000000000000000 [ 200.224008] RDX: 0000000000000000 RSI: 0000000000000246 RDI: 0000000000000246 [200.224008] RBP: 0000000000000000 R08: ffff9fe43fde3cb8 R09: 00000000000000d5 [ 200.224008] R10:
    ffffbf3c8cb53d90 R1100000000000f4240 R12ffff9fe43fde8700 [ 200.224008] R130000000000000000 R14
     R15ffffa0799ad6bca0  : ffffa0799ad6bca8 [ 200.224008] FS: 0000000000000000(0000) GS:ffff9fe43fdc0000(0000) knlGS:0000000000000000 [ 200.224008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 200.224008] CR2:
    ffffffffc0b28a30 CR300000097fe00a002 CR400000000007606e0 [ 200.224008] DR0: 0000000000000000 DR1
    0000000000000000 DR2: 0000000000000000 [200.224008] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7:
    0000000000000400 [ 200.224008] PKRU55555554 [ 200.224008] 呼叫追踪 [ 200.224008] ? process_one_work+0x195/0x390 [ 200.224008] ? worker_thread+0x30/0x390 [ 200.224008] ? process_one_work+0x390/0x390 [ 200.224008] ? kthread+0x10d/0x130 [ 200.224008] ? kthread_flush_work_fn+0x10/0x10 [ 200.224008] ? ret_from_fork+0x35/0x40 [ 200.224008] CPU 63 上啟動的核心錯誤 (0x1) 通知 [ 200.224008] CPU 63 上完成的核心錯誤 (0x1) 通知 [200.224008] ] CR2ffffffffc0b28a5a [ 200.224008] ---[ end trace c82a412d93f57412 ]--- 原因如下T1rmmod ipmi_si。 ->ipmi_unregister_smi() -> ipmi_bmc_unregister() -> __ipmi_bmc_unregister() -> kref_put(&bmc->usecount, cleanup_bmc_device); -> schedule_work(&bmc->remove_work); T2rmmod ipmi_msghandl
    ---truncated--- (CVE-2021-47100)

請注意，Nessus 依賴供應商報告的套件存在。

偵測

Linux Distros 未修補的弱點：CVE-2021-47100

medium Nessus Plugin ID 247874

版本 1.15